This audio adaptor lets you easily add high quality 16 bit, 44.1 kHz sample rate (CD quality) audio to your projects with Teensy 4.0 (Rev D, as of Feburary 17, 2025). It supports stereo headphone and stereo line-level output, and also stereo line-level input or mono microphone input. https://elecena.pl/product/17502467/audio-adapter-board-for-teensy-4-x 2021-04-07 https://elecena.pl/product/17502467/audio-adapter-board-for-teensy-4-x 2025-04-23